Check whether text is valid JSON and see the parsed root type. Paste any JSON document to get an instant valid-or-invalid verdict with detail.
🔒 Your file is processed locally in your browser whenever supported. This tool runs entirely on your device — nothing you type or upload is sent to a server, logged, or stored.
Paste it into the validator. A valid document returns true with its root type (object, array, string and so on); an invalid one returns false with the parse error detail.
| Platform | Supported | Offline | Local | Server | Network |
|---|---|---|---|---|---|
| WEB | Yes | Yes | Yes | No | Not required |
| PWA | Yes | Yes | Yes | No | Not required |
| ANDROID | Yes | Yes | Yes | No | Not required |
| IOS | Yes | Yes | Yes | No | Not required |
Pretty-print and validate JSON with clear error messages.
Compress JSON by removing whitespace for smaller payloads.
Convert simple flat YAML (key: value lines) into JSON.
Convert CSV with a header row into a JSON array.
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